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Two long and parallel straight wires A a...

Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.

Text Solution

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`I _(1) = 8 A, I _(2) = 5 A, r = 4 cm = 4 xx 10 ^(-2) m, l = 10 cm = 10 xx 10 ^(-2) m`
`(F)/(l) = ( mu _(0))/( 4pi) ( 2 I _(1) I _(2))/( r ) or, F = ( mu _(0))/( 4pi) ( 2 I _(1) I _(2))/(r) l = ( 10 ^(-7) xx 2 xx 8 xx 5 xx 10 xx 10 ^(-2))/(4 xx 10 ^(-2)) = 2 xx 10 ^(-5)` (attractive)
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